51223247 has 2 divisors, whose sum is σ = 51223248. Its totient is φ = 51223246.

The previous prime is 51223217. The next prime is 51223301. The reversal of 51223247 is 74232215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51223247 - 2⁸ = 51222991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51223217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25611623 + 25611624.

It is an arithmetic number, because the mean of its divisors is an integer number (25611624).

Almost surely, 2^51223247 is an apocalyptic number.

51223247 is a deficient number, since it is larger than the sum of its proper divisors (1).

51223247 is an equidigital number, since it uses as much as digits as its factorization.

51223247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 26.

The square root of 51223247 is about 7157.0417771591. The cubic root of 51223247 is about 371.3832976728.

The spelling of 51223247 in words is "fifty-one million, two hundred twenty-three thousand, two hundred forty-seven".